Variation in seasonal timing traits and life history along a latitudinal transect in Mimulus ringens
Variation in seasonal timing traits and life history along a latitudinal transect in Mimulus ringens
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DOI：
10.1111/jeb.13941
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发表时间：
2021-09
影响因子：
2.1
通讯作者：
Kelly Vest;James M Sobel
中科院分区：
文献类型：
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作者：
Kelly Vest;James M Sobel
季节性的时间性状通常是经常性的，空间可变的选择，因此预测表现出倾斜的变化。温带多年生植物往往需要春化，以促进生长和繁殖，然而，很少有人知道春化的要求是否在广泛分布的物种的范围内变化。我们对Mimulus ringens进行了关键的春化持续时间研究，并结合种群基因组分析。将来自跨越纬度范围的8个种群的植物暴露于0至56天之间的不同持续时间的4°C春化，并评估开花反应。还进行了RADSeq以产生1179个多态性SNP，其用于检查群体结构。我们发现了意想不到的生活史变化，与一些人口缺乏春化的要求。种群基因组分析表明，这些生活史变异与多年生植物高度不同，可能揭示了一个神秘的物种。对于多年生种群，最小春化时间是惊人的一致。然而，一旦春化，北方种群开花几乎3周快于南方。此外，南方种群表现出敏感性春化时间超出开花能力，这表明有能力适应不同长度的冬天。因此，Mimulus ringens揭示了倾斜变异的证据，并为未来的研究提供了机会，解决机制和生态假说内和之间的初期物种。
Seasonal timing traits are commonly under recurrent, spatially variable selection, and are therefore predicted to exhibit clinal variation. Temperate perennial plants often require vernalization to prompt growth and reproduction; however, little is known about whether vernalization requirements change across the range of a broadly distributed species. We performed a critical vernalization duration study in Mimulus ringens, coupled with population genomic analysis. Plants from eight populations spanning the latitudinal range were exposed to varying durations of 4°C vernalization between 0 and 56 days, and flowering response was assessed. RADSeq was also performed to generate 1179 polymorphic SNPs, which were used to examine population structure. We found unexpected life history variation, with some populations lacking vernalization requirement. Population genomic analyses show that these life history variants are highly divergent from perennials, potentially revealing a cryptic species. For perennial populations, minimum vernalization time was surprisingly consistent. However, once vernalized, northern populations flowered almost 3 weeks faster than southern. Furthermore, southern populations exhibited sensitivity to vernalization times beyond flowering competency, suggesting an ability to respond adaptively to different lengths of winter. Mimulus ringens, therefore, reveals evidence of clinal variation, and provides opportunities for future studies addressing mechanistic and ecological hypotheses both within and between incipient species.